content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
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  package com.google.protobuf;
  
  import static protobuf_unittest.UnittestProto.optionalInt32Extension;
  
  import protobuf_unittest.UnittestProto.TestAllExtensions;
  import protobuf_unittest.UnittestProto.TestAllTypes;
  import java.io.IOException;
  import junit.framework.TestCase;
  
  /**
   * Unit test for {@link LazyFieldLite}.
   *
   * @author xiangl@google.com (Xiang Li)
   */
  public class LazyFieldLiteTest extends TestCase {
  
    public void testGetValue() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testGetValueEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
    }
  
    public void testSetValue() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
      message = lazyField.getValue(TestAllTypes.getDefaultInstance());
      changeValue(lazyField);
      assertEquals(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testSetValueEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
      MessageLite value = lazyField.getValue(TestAllExtensions.getDefaultInstance());
      changeValue(lazyField);
      assertEquals(value, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
    }
  
    public void testGetSerializedSize() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.getSerializedSize(), lazyField.getSerializedSize());
      changeValue(lazyField);
      assertNotEqual(message.getSerializedSize(), lazyField.getSerializedSize());
    }
  
    public void testGetSerializedSizeEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.getSerializedSize(), lazyField.getSerializedSize());
      changeValue(lazyField);
      assertNotEqual(message.getSerializedSize(), lazyField.getSerializedSize());
    }
  
    public void testGetByteString() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.toByteString(), lazyField.toByteString());
      changeValue(lazyField);
      assertNotEqual(message.toByteString(), lazyField.toByteString());
    }
  
    public void testGetByteStringEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.toByteString(), lazyField.toByteString());
      changeValue(lazyField);
      assertNotEqual(message.toByteString(), lazyField.toByteString());
    }
  
    public void testMergeExtensions() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite original = createLazyFieldLiteFromMessage(message);
      LazyFieldLite merged = new LazyFieldLite();
      merged.merge(original);
      TestAllExtensions value = (TestAllExtensions) merged.getValue(
          TestAllExtensions.getDefaultInstance());
      assertEquals(message, value);
    }
  
    public void testEmptyLazyField() throws Exception {
      LazyFieldLite field = new LazyFieldLite();
      assertEquals(0, field.getSerializedSize());
      assertEquals(ByteString.EMPTY, field.toByteString());
    }
  
    public void testInvalidProto() throws Exception {
      // Silently fails and uses the default instance.
      LazyFieldLite field = new LazyFieldLite(
          TestUtil.getExtensionRegistry(), ByteString.copyFromUtf8("invalid"));
      assertEquals(
          TestAllTypes.getDefaultInstance(), field.getValue(TestAllTypes.getDefaultInstance()));
      assertEquals(0, field.getSerializedSize());
      assertEquals(ByteString.EMPTY, field.toByteString());
    }
  
    public void testMergeBeforeParsing() throws Exception {
      TestAllTypes message1 = TestAllTypes.newBuilder().setOptionalInt32(1).build();
      LazyFieldLite field1 = createLazyFieldLiteFromMessage(message1);
      TestAllTypes message2 = TestAllTypes.newBuilder().setOptionalInt64(2).build();
      LazyFieldLite field2 = createLazyFieldLiteFromMessage(message2);
  
      field1.merge(field2);
      TestAllTypes expected =
          TestAllTypes.newBuilder().setOptionalInt32(1).setOptionalInt64(2).build();
      assertEquals(expected, field1.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testMergeOneNotParsed() throws Exception {
      // Test a few different paths that involve one message that was not parsed.
      TestAllTypes message1 = TestAllTypes.newBuilder().setOptionalInt32(1).build();
      TestAllTypes message2 = TestAllTypes.newBuilder().setOptionalInt64(2).build();
      TestAllTypes expected =
          TestAllTypes.newBuilder().setOptionalInt32(1).setOptionalInt64(2).build();
  
      LazyFieldLite field1 = LazyFieldLite.fromValue(message1);
      field1.getValue(TestAllTypes.getDefaultInstance());  // Force parsing.
      LazyFieldLite field2 = createLazyFieldLiteFromMessage(message2);
      field1.merge(field2);
      assertEquals(expected, field1.getValue(TestAllTypes.getDefaultInstance()));
  
      // Now reverse which one is parsed first.
      field1 = LazyFieldLite.fromValue(message1);
      field2 = createLazyFieldLiteFromMessage(message2);
      field2.getValue(TestAllTypes.getDefaultInstance());  // Force parsing.
      field1.merge(field2);
      assertEquals(expected, field1.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testMergeInvalid() throws Exception {
      // Test a few different paths that involve one message that was not parsed.
      TestAllTypes message = TestAllTypes.newBuilder().setOptionalInt32(1).build();
      LazyFieldLite valid = LazyFieldLite.fromValue(message);
      LazyFieldLite invalid = new LazyFieldLite(
          TestUtil.getExtensionRegistry(), ByteString.copyFromUtf8("invalid"));
      invalid.merge(valid);
  
      // We swallow the exception and just use the set field.
      assertEquals(message, invalid.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testMergeKeepsExtensionsWhenPossible() throws Exception {
      // In this test we attempt to only use the empty registry, which will strip out all extensions
      // when serializing and then parsing. We verify that each code path will attempt to not
      // serialize and parse a message that was set directly without going through the
      // extensionRegistry.
      TestAllExtensions messageWithExtensions =
          TestAllExtensions.newBuilder().setExtension(optionalInt32Extension, 42).build();
      TestAllExtensions emptyMessage = TestAllExtensions.newBuilder().build();
  
      ExtensionRegistryLite emptyRegistry = ExtensionRegistryLite.getEmptyRegistry();
  
      LazyFieldLite field = LazyFieldLite.fromValue(messageWithExtensions);
      field.merge(createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage));
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
  
      // Now reverse the order of the merging.
      field = createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage);
      field.merge(LazyFieldLite.fromValue(messageWithExtensions));
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
  
      // Now try parsing the empty field first.
      field = LazyFieldLite.fromValue(messageWithExtensions);
      LazyFieldLite other = createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage);
      other.getValue(TestAllExtensions.getDefaultInstance());  // Force parsing.
      field.merge(other);
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
  
      // And again reverse.
      field = createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage);
      field.getValue(TestAllExtensions.getDefaultInstance());  // Force parsing.
      other = LazyFieldLite.fromValue(messageWithExtensions);
      field.merge(other);
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
    }
  
  
    // Help methods.
  
    private LazyFieldLite createLazyFieldLiteFromMessage(MessageLite message) {
      return createLazyFieldLiteFromMessage(TestUtil.getExtensionRegistry(), message);
    }
  
    private LazyFieldLite createLazyFieldLiteFromMessage(
        ExtensionRegistryLite extensionRegistry, MessageLite message) {
      ByteString bytes = message.toByteString();
      return new LazyFieldLite(extensionRegistry, bytes);
    }
  
    private void changeValue(LazyFieldLite lazyField) {
      TestAllTypes.Builder builder = TestUtil.getAllSet().toBuilder();
      builder.addRepeatedBool(true);
      MessageLite newMessage = builder.build();
      lazyField.setValue(newMessage);
    }
  
    private void assertNotEqual(Object unexpected, Object actual) {
      assertFalse(unexpected == actual
          || (unexpected != null && unexpected.equals(actual)));
    }
  
  }
  